What are some alternatives?
When comparing lhorie.github.io mithril and Ruby on Rails, you can also consider the following products
Vue.js - Reactive Components for Modern Web Interfaces
Django - The Web framework for perfectionists with deadlines
Laravel - A PHP Framework For Web Artisans
AngularJS - AngularJS lets you extend HTML vocabulary for your application. The resulting environment is extraordinarily expressive, readable, and quick to develop.